Messages in this thread | | | Subject | Re: Ingo's realtime_preempt patch causes kernel oops | From | Yann.LEPROVOST@wavecom ... | Date | Tue, 23 May 2006 19:10:30 +0200 |
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Currently there are only system timer and debug serial unit registered on irq line 1. Debug serial unit is used as the console !
Steven Rostedt <rostedt@goodmis. org> To Sent by: Yann.LEPROVOST@wavecom.fr linux-kernel-owne cc r@vger.kernel.org Daniel Walker <dwalker@mvista.com>, linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>, Thomas 23/05/2006 19:00 Gleixner <tglx@linutronix.de> Subject Re: Ingo's realtime_preempt patch causes kernel oops
On Tue, 2006-05-23 at 18:27 +0200, Yann.LEPROVOST@wavecom.fr wrote: > I forgot to say that I let SA_SHIRQ as the IRQ line is shared... > It seems to work correctly...
What shares it?
Reason I ask, is that this irq is now running in true interrupt context, and that on PREEMPT_RT the spin_locks are mutexes and can schedule. So if another device is sharing this irq, then its interrupt handler will be running in interrupt context, and if it grabs a spin_lock than is not a raw_spinlock_t then you will have a crash.
This won't be a problem if you only turn on Hard irqs as threads and don't do the PREEMPT_RT.
-- Steve
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